Explanipedia

Biogeochemical evolution of ponded meltwater in a High Arctic subglacial tunnel Open

Ashley J. Dubnick, Rachel L. Spietz, Brad Danielson, Mark Skidmore, Eric S. Boyd , et al. · 2023

Subglacial environments comprise ∼10 % of Earth's land surface, host active microbial ecosystems, and are important components of global biogeochemical cycles. However, the broadly inaccessible nature of subglacial systems has left them va…

Comment on tc-2022-240 Open

Ashley J. Dubnick, Rachel L. Spietz, Brad Danielson, Mark Skidmore, Eric S. Boyd , et al. · 2023

Abstract. Subglacial environments comprise ~10 % of Earth’s land surface, host active microbial ecosystems, and are important components of global biogeochemical cycles. However, the broadly inaccessible nature of subglaci…

Biogeochemical evolution of ponded meltwater in a High Arctic subglacial tunnel Open

Ashley J. Dubnick, Rachel L. Spietz, Brad Danielson, Mark Skidmore, Eric S. Boyd , et al. · 2023

Subglacial environments comprise ~10 % of Earth’s land surface, host active microbial ecosystems, and are important components of global biogeochemical cycles. However, the broadly inaccessible nature of subglacial systems has left them va…

Supplementary material to "Biogeochemical evolution of ponded meltwater in a High Arctic subglacial tunnel" Open

Ashley J. Dubnick, Rachel L. Spietz, Brad Danielson, Mark Skidmore, Eric S. Boyd , et al. · 2023

Methods S1: Water isotope fractionation modelA model was developed using the principles of isotopic fractionation to estimate the isotopic composition of incremental ice, incremental vapor, and residual water as a hydraulically isolated wa…

Subglacial Deformation of Permafrost Beneath Wright Lower Glacier, Antarctica as Revealed by Direct Observations and Measurements from a Subglacial Tunnel Open

Sean J. Fitzsimons, Martin Sharp, Regi Lorrain · 2023

Canadian high arctic ice core records of organophosphate flame retardants and plasticizers Open

Amila O. De Silva, Cora J. Young, Christine N. Spencer, Derek C. G. Muir, Martin Sharp , et al. · 2023

Arctic ice cap cores were analyzed for organophosphate esters (OPEs). Depositional flux increased exponentially over 4 decades at one site but were lower further north. Some OPEs were associated with anthropogenic particles, possibly micro…

Biogeochemical evolution of ponded meltwater in a High Arctic subglacial tunnel Open

Ashley J. Dubnick, Rachel L. Spietz, Brad Danielson, Mark Skidmore, Eric S. Boyd , et al. · 2022

Geochemical data for the paper "Biogeochemical evolution of ponded meltwater in a High Arctic subglacial tunnel"

Scott Polar Research Institute Arctic Airborne Radio-Echo Sounding Datasets: Canadian Arctic 2000 Open

Julian A. Dowdeswell, Toby Benham, Micheal R Gorman, Donald W. Burgess, Martin Sharp · 2021

This data set contains radar sounder profiles from the SPRI 100 MHz ice-penetrating radar instrument over Devon and Ellesmere islands in the Canadian Arctic (CA). Along with the radar profile data, the archive includes derived and ancillar…

Arctic Report Card 2020: Glaciers and Ice Caps Outside of Greenland Open

G. J. Wolken, Bert Wouters, Martin Sharp, Liss M. Andreassen, David Burgess , et al. · 2020

The Arctic Open

Jonas Kvist Andersen, Liss M. Andreassen, Emily H. Baker, Thomas J. Ballinger, Logan T. Berner , et al. · 2020

peer reviewed

Ice Core Record of Persistent Short‐Chain Fluorinated Alkyl Acids: Evidence of the Impact From Global Environmental Regulations Open

Heidi M. Pickard, Alison S. Criscitiello, Daniel Persaud, Christine Spencer, Derek C. G. Muir , et al. · 2020

Short chain perfluoroalkylcarboxylic acids (scPFCAs, C x F 2x+1 COOH, x ≤ 3) are persistent compounds formed from atmospheric oxidation of fluorotelomer compounds and chlorofluorocarbon (CFC) replacements introduced as a result of the Mont…

Classification of glaciers during summer in Southern Rocky Mountain Trench using surface albedo and temperature anomalies Open

Ali Naeimi, Martin Sharp · 2020

<p>Under most atmospheric conditions, the albedo and temperature of surface snow and ice are two of the main influences on the energy budget for glacier melting. Given that surface albedo and temperature are linked, knowing where and…

Basal thermal regime affects the biogeochemistry of subglacial systems Open

Ashley Dubnick, Martin Sharp, Brad Danielson, Alireza Saidi‐Mehrabad, Joel Barker · 2020

Ice formed in the subglacial environment can contain some of the highest concentrations of solutes, nutrients, and microbes found in glacier systems, which can be released to downstream freshwater and marine ecosystems and glacier forefiel…

Basal thermal regime affects the biogeochemistry of subglacial systems Open

Ashley Dubnick, Martin Sharp, Brad Danielson, Alireza Saidi‐Mehrabad, Joel Barker · 2019

Ice formed in the subglacial environment can contain some of the highest concentrations of solutes, nutrients, and microbes found in glacier systems. Upon glacial melt, these materials are released to downstream freshwater and marine ecosy…

Proglacial freshwaters are significant and previously unrecognized sinks of atmospheric CO <sub>2</sub> Open

Kyra A. St. Pierre, Vincent L. St. Louis, Sherry L. Schiff, Igor Lehnherr, Paul G. Dainard , et al. · 2019

Significance Glacier melt is one of the most dramatic consequences of climate change in high-latitude and high-altitude environments. As meltwaters move across poorly consolidated landscapes, they transport vast quantities of highly reacti…

Atmospheric forcing of rapid marine-terminating glacier retreat in the Canadian Arctic Archipelago Open

Alison Cook, Luke Copland, Brice Noël, Chris R. Stokes, Michael J. Bentley , et al. · 2019

Marine-terminating glaciers in the Canadian Arctic Archipelago have retreated in response to atmospheric, not oceanic, warming.

Influence of recent warming and ice dynamics on glacier surface elevations in the Canadian High Arctic, 1995–2014 Open

Colleen Mortimer, Martin Sharp, Wesley Van Wychen · 2018

Repeat airborne laser altimetry measurements show widespread thinning (surface lowering) of glaciers in Canada's Queen Elizabeth Islands since 1995. Thinning rates averaged for 50 m elevation bins, were more than three times higher during …

Continuous non-marine inputs of per- and polyfluoroalkyl substances to the High Arctic: a multi-decadal temporal record Open

Heidi M. Pickard, Alison S. Criscitiello, Christine Spencer, Martin Sharp, Derek C. G. Muir , et al. · 2018

Perfluoroalkyl acids (PFAAs) are persistent, in some cases, bioaccumulative compounds found ubiquitously within the environment. They can be formed from the atmospheric oxidation of volatile precursor compounds and undergo long-range trans…

Discovery of a hypersaline subglacial lake complex beneath Devon Ice Cap, Canadian Arctic Open

Anja Rutishauser, Donald D. Blankenship, Martin Sharp, Mark Skidmore, Jamin S. Greenbaum , et al. · 2018

A possible analog for saline lakes on planetary ice bodies lurks beneath a Canadian Arctic ice cap.

The world’s largest High Arctic lake responds rapidly to climate warming Open

Igor Lehnherr, Vincent L. St. Louis, Martin Sharp, Alex Gardner, John P. Smol , et al. · 2018

Spatiotemporal variability of Canadian High Arctic glacier surface albedo from MODIS data, 2001–2016 Open

Colleen Mortimer, Martin Sharp · 2018

Inter-annual variations and longer-term trends in the annual mass balance of glaciers in Canada's Queen Elizabeth Islands (QEI) are largely attributable to changes in summer melt. The largest source of melt energy in the QEI in summer is n…

Continuous Non-Marine Inputs of Per- and Polyfluoroalkyl Substances to the High Arctic: A Multi-Decadal Temporal Record Open

Heidi M. Pickard, Alison S. Criscitiello, Christine N. Spencer, Martin Sharp, Derek C. G. Muir , et al. · 2017

Perfluoroalkyl acids (PFAAs) are persistent, bioaccumulative compounds found ubiquitously within the environment. They can be formed from the atmospheric oxidation of volatile precursor compounds and undergo long-range transport through th…

Supplementary material to "Continuous Non-Marine Inputs of Per- and Polyfluoroalkyl Substances to the High Arctic: A Multi-Decadal Temporal Record" Open

Heidi M. Pickard, Alison S. Criscitiello, Christine N. Spencer, Martin Sharp, Derek C. G. Muir , et al. · 2017

7. Rates of Chemical Weathering in Glaciated Terrain (MT) Open